Improvement in steam-generators



UNITED STATES PATENT OFFICEG M. M. ROUNDS, OF NFV HAVEN, CONNECTICUT, ASSIGNOR TO HIMSELF AND WM. YELLNER, OF NEY YORK CITY, AND J. E. JEROLD, OF JERSEY CITY,

NEW JERSEY.

IMPROVEMENT IN STEAM-GENERATORS.

Specification forming part of Letters Patent No. 55,785, dated June 19, 1866.

To all whom it may concern Be it known that I, M. M. ROUNDS, of New Haven, in the county of New Haven and State of Connecticut, have invented a new Improvementin Steam-Boilers; and I doherebydeclarc the following', when taken in connection with the accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent, in-

Figure 1, a side view of the tire-box end of the boiler; Fig. 2, a front-end view ofthe same; Fig. 3, a longitudinal vertical central section, and in Fig. 4 a transverse section on line a: x.

My invention relates to an improvement in the internal construction of steanrboilers, whereby the fire-surface is greatly increased and the fire made more eiiective 5 and it consists in the introduction of tubes opening through the crown-sheet into the fire-box near the front end, by which arrangement the fire is drawn toA the front, thereby increasing its effective force.

To enable others skilled in the art to construct and use my improvement, I will proceed to describe the same, as illustrated in the accompanying drawings.

A is the outer case of the boiler, B the inner case, C the crownsheet, and D the tube-sheet, all of the usual or any approved form and construction, the tubes a a being inserted through the tube-sheet D in the usual manner. By this construction the heat from the re is naturally and forcibly drawn from the front end of the boiler, making the crown-sheet and front of but very little effective use, and not being heated to the same degree that other parts of the boiler areheated is, to the extent of the difference of the heat, a disadvantage.

To render the crown-sheet more serviceable as Ere-surface, I introduce tubes d, (see Figs. 3 and 4,) passing above the crownsheet C, and opening into the tire-b0x E, near the frontend, as seen in Fig. 3. .The draft through the tubes d being equal to the draft through the tube c, a large portion ofthe heat will be drawn to the front end of the boiler, passing out, through the tubes d, and thus drawing the heat toward the front end of the iireboX, the service of the crowirsheet will be proportionately increased.

In addition to this eXtra service, the tubes d. form an increased amount oftire-surface near the surface of the water, and, if preferred, the tubes d may be carried a portion or the whole ot' their length above the surface of the water, thereby superheatin g the steam. In some cases this arrangement for superheating would be a great advantage 5 butin such cases it would be better that the tubespass below the surface of the water to near the dome; then rising above the large amount of surface would sufficiently superheat the steam for all practical purposes.

Having, therefore, thus fully described my improvement, what I claim as new and useful,

and desire to secure by Letters Patent, isV

The tubes d, arranged in the crown-sheet C so as to open into the lire-box, substantially as and for the purpose specified.

M. M. ROUN DS. Witnesses:

JOHN E. EARLE, JOHN H. SHUMWAY. 

